Patent US1921316A successfully refreshed from Google Patents.
US1921316A
Expired / Lapsed
US
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Expanding mandrel
Assignee: HEMPY COOPER Manufacturing Co
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Filing: 1930-01-20
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Granted: 1933-08-08
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Expires: 1950-01-20
Abstract
No abstract record available.
Inventors
- 👤 Herman T Mattern
- 👤 Lindstrom Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:12
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/40; B23B31/408; Y; Y10; Y10T; Y10T279/00; Y10T279/10; Y10T279/1004; Y10T279/1037; Y10T279/1041; Y10T279/1045; Y10T82/00; Y10T82/26; Y10T82/266; Y10T82/268
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-08-07 | 1937-02-06 | 1937-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-08-07 | 1941-02-06 | 1941-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-08-07 | 1945-02-06 | 1945-08-08 | $7700.00 | Window Closed / Lapsed |